疲劳荷载作用下铰接板桥挠度试验  

Experiment on deflection of hinged slab bridge under fatigue loads

作　　者：唐先习[1] 孙焕重 朱彦鹏[1] 徐岳[3] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]中铁十四局集团第二工程有限公司,山东泰安271000 [3]长安大学公路学院,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2014年第2期65-70,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51168030)

摘　　要：为了研究铰接板桥在疲劳荷载作用下的挠度变化规律，制作了2组钢筋混凝土板桥试件，一组进行疲劳试验，另一组对应地进行静载试验。在试验过程中，分别取疲劳循环达到一定次数后静载作用下的板桥跨中挠度值和挠度残余累加值进行研究，并将疲劳荷载作用后的板桥与只进行静载试验的板桥在静载作用下的跨中挠度变化规律进行对比分析。研究结果表明：当疲劳循环次数未超过200×10^4次时，由于疲劳幅值未超过特定值，故随着疲劳次数的增加，施加静载时挠度值随静载值的增加逐渐呈线性关系，同时对于不同疲劳次数，施加相同静载时挠度值的变化呈现一定的规律性；当疲劳循环次数达200×10^4～250×10^4次，疲劳幅值增大时，挠度随施加静栽值的变化规律仍近似呈线性，但在相同静载作用下，挠度值比未超过200×10^4次时的值增加较多，同时一定幅值下的疲劳循环次数及不同的疲劳幅值均会对板桥的疲劳残余产生影响；由静载试验梁的荷载一挠度曲线的对比可看出，经过疲劳荷载作用后，板桥挠度随施加荷载的变化更接近于线性变化。For the study on the deflection change regulation of hinged slab bridge under the fatigue loads, two groups of reinforced concrete slab bridge specimens were made. The fatigue test was carried out on one group of specimens, and the corresponding static load test was carried out on another group of specimens. The deflection and cumulative residual of mid-span under static load after certain fatigue cir- cles were studied. The comparison between deflection changes of slab bridge under fatigue load and static load was conducted. The results show that as the fatigue cycle number is no more than 2 million times, for the fatigue amplitude is no more than the certain value, the deflection value has a linear relationship with static load applied gradually with the increase of the fatigue cycle number. At the same time, for different fatigue cycles, the deflection change presents certain regularity with the same static load. As the fatigue cycle number increases from 2 million to 2. 5 million times, for the fatigue amplitude increases,the change regulation of slab deflection with static load applied is approximately linear, but the deflection value increases more than the that when the fatigue cycles times is no more than 2 million times. At the same time, the number of fatigue cycles under certain amplitude and different fatigue amplitudes will af- fect the fatigue residual of slab bridge. It can be seen through the comparison of load-deflection curves of the static load specimen, after the effect of fatigue load, the deflection change with load applied is close to a linear change. 12 figs, 14 refs.

关 键 词：桥梁工程 铰接板桥 疲劳荷载 挠度 疲劳次数 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]